Propelling mechanism for boats



Sept. 29, 1525. v v 1,555,011

A. LIND PROPELLING MECHANISM FOR BOIATSY Filed May 15. 1923 3 SheetS-She'fi 1- Plg i.

Sept. 2

A. LIND PROPELLING MECHANISM FOR BOATS Filed May 15. 1923 3 Sheets-Sheet 2 Sept. 29, 1925.

A. LIND PROPELLING MECHANISM FOR BOATS Filed May 15. 1923 3 ShGGtS-Shf 3 Patented Sept. 29, 1925.

UNITED STATES PATENT OFFICE.

anvil) LIND, or STOCKHOLM, SWEDEN;

Application filed May 15, 1923.

To all whom it may concern:

Be it known that I, ARVID LIND, a citizen of the Kingdom of Sweden, residing at Stockholm, Sweden, have invented new and useful Improved Propelling Mechanism for Boats, of which the following is a specification.

The present invention relates to that type of propelling mechanism for motor boats which comprises a suspension device adapted to be attached to the bulwark of the boat, an internal combustion engine having a substantially vertical shaft, and a screw propeller attached to the lower end of said shaft.

The object of the invention is to provide a propelling mechanism of the kind referred to which is compact and has a low weight in relation to its effect, is easily to start and runs uniformly. 4

The invention is characterized, chiefly, by that the propelling mechanism comprises an explosion engine of the two stroke type provided with a plurality of cylinders the axes of which are parallel to the engine shaft and the pistons of which are in direct engagement with a gyratorically swinging thrust disk journalled on an oblique hub secured to the engine shaft.

The invention is illustrated on the accompanying drawings inwhich, Figure l is a side elevation of the entire propelling mechanism; Fig. 2 is a plan view thereof; Fig. 3 is a rear end view of the mecl'ianism with the lower portion of the shaft and the screw propeller removed. Fig. 1- is a view showing the steering mechanism from the under side thereof. Fig. 5 is a vertical section on a larger scale of the engine taken along the line AB in Fig. 7 Fig. 6 shows a detail of the suspension device. Fig. 7 is a plan view of the engine with the flywheel removed.

Referring to' the drawings the engine illustrated comprises four cylinders 1, which are uniformly distributed around the vertical, centrally arranged shaft 2 with their axes extending parallel to the shaft of the engine. Each cylinder contains a piston 3 engaged by a thrust disc 41 mounted on an oblique hub secured tothe shaft 2, by means of a ball and socket joint including a perforated ball 5 on an extension of the disc and sliding blocks 6 mounted in the pistons. The cylinder chamber 7 above the upper PROPELLING MECHANISM FOR BOATS.

Serial No. 639,106.

below the lower ends of the pistons form pumping chambers 43 to enable a precompression of the charge which is drawn in through a charge forming chamber not shown in the drawing and through passages formed in a slide valve attached to the shaft and rotating therewith. The design and operation of the engine proper is considered not to require any further explanation, as the engine is substantially similar to that described in my copending application Ser. No. 638,889. r

Provided at the lower end of the engine block is abase member 12 by means of which the said block rests on an annular, downwardlytapering bracket 18 carried by the suspension device 14;, by means of which the propelling mechanism is adapted to be suspended at the bulwark of a boat. The lower portion of the said base member 12 forms a conical seat 15 having passages 16 leading to the cooling jacket of the cylinders; Rotatably mounted within the seat 15 is a cock plug 17 having passages 18 in permanent communication with the said passages 16 independent of the position of the plug. The cock plug 17 is rigidly connected to two sleeves 19 and 20 concentrically surrounding the shaft 2 and forming between themselves a passage or channel 21 to enable cooling water to pass the cooling jacket of the cylinders from a pump 23 provided in connection with the hub 22 of the screwpropeller. The said sleeves 19 and 20 are also rigidly connected to the hub 22 of the screw-propeller. The screw-propeller hub surrounds in the usual way a bevel gear whereby the rotation of the engine shaft is transmitted to the screw-prope-ller 24:. At. its lower end the hub 22 carries, preferably in well-known manner, a rudder 25 to facilitate steering. The steering is effected by rotating the hub of the screw-propeller tonormal position.

' 2.6 amounts to .2: 1 thereby enabling the boat to .bepropelled .astern by rotating the hand wheel one revolution so'as to cause the hub of the screw-propeller to swing half a revolution around shaft 2. A casing 30 removably. attached below the fiy-wheel 31 is provvided toprotect the sparking plugs 32 of the cylinders against water. 33 is an an- .nular receptacle surrounding the lower portion of the cylinder block and adapted to receive the liquid fuel. neto-electric generator for the ignition, said generator being driven from the shaft 2 by means of a toothedgearing35, a distributor 36. of well known design be-ingprovided secured to the shaft 2 to transmit the current from the said generator to the sparking plugs. 37 designates holding members to lock the engine to the bracket 13, said members to this end being provided with handles 38 actingas cams. To obtain suflicient rigidity of the mounting of the engine in the suspension device the latter is provided with a guiding ring 39 carried by depending arms 40, said ring surrounding a short-sleeve or bushing 41 secured to the sleeve-20. The bracket 13 as well as the guiding ring 39 are open at their rear sidesto permit the engine with its shaft and the screw-propeller to be removed from the suspension device after the holding members 37 have been released and said firstmentioned parts have been lifted slightly in relation to the suspension device.

While in the mechanism shown the en- 34 designates a maggine with its shaft and the screw-propeller may be removed from the suspension device by being lifted out thereof it'may be more convenient in certain cases to divide the shaft 2 so that the engine proper only may be removed, while the lower portion of the shaft together with the propeller still remains suspended in the suspension device.

It is evident that the invention is not limited to the .details shown, as the construc tional details may be varied in different ways.withoutdeparting from the principle of the invention.

That I claim is:

l. Propelling mechanism for boats, comprising an internal combustion engine of the two stroke type having a vertical central shaft and a plurality of cylinders grouped around said shaft and having pistons engaged by a gyratorically swinging thrust disc journalled on an oblique hub secured to said shaft, a screw-propeller at the lower end ofsaid shaft, and a suspension device adapted to be secured to thebulwark of a boat, an open seat in said suspension device adapted to carry the lower end of the cylinder block, arms extending downwards from said seat, an open ring secured to said arms, a sleeve surrounding the vertical shaft, and a bushing secured tosaid sleeveand guided by said ring.

2. Propelling mechanism for boats, comprising an internal combustion engine of the two stroke type having a vertical central shaftand a cylinder block containing a plurality of axially extending cylinders, a cock housing at the lower end of the cylinder block, a cock plug, two concentric sleeves connected to said cock plug forming between themselves a supply channel for cooling water, and a pump for delivering cooling water through said channel and cook plug and housing to thecylinder block.

In testimony whereof I have signed my name.

ARVID Linn 

